update

src/handmade.h

@@ -2,7 +2,6 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <math.h>
-#include <windows.h>
 
 #pragma once
 

src/win32_handmade.cpp

@@ -252,12 +252,7 @@ internal void win32InitSound(HWND window, int32 samplesPerSec, int bufferSize) {
     }
 }
 
-LRESULT mainWindowCallback(
-  HWND window,
-  UINT message,
-  WPARAM wParam,
-  LPARAM lParam
-) {
+LRESULT mainWindowCallback(HWND window, UINT message, WPARAM wParam, LPARAM lParam) {
     LRESULT result = 0;
     switch (message) {
         case WM_SIZE: {
@@ -354,18 +349,24 @@ internal void win32FillSoundBuffer(Win32SoundOutput *soundOutput, DWORD byteToLo
     }
 }
 
-internal void win32BeginRecordingInput(Win32State *win32State, int inputRecordingIndex) {
-    win32State->inputRecordingIndex = inputRecordingIndex;
-    char *filename = "replay.ipt";
-    win32State->recordingHandle = CreateFileA(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, NULL, NULL);
-    DWORD bytesToWrite = (DWORD)win32State->gameMemoryTotalSize;
-    Assert(bytesToWrite < 0xFFFFFFFF);
-    DWORD bytesWritten;
-    WriteFile(win32State->recordingHandle, win32State->gameMemoryBlock, bytesToWrite, &bytesWritten, NULL);
+internal Win32ReplayBuffer* win32GetReplayBuffer(Win32State *state, int unsigned index) {
+    Win32ReplayBuffer *result = &state->replayBuffers[index - 1];
+    return result;
+}
+
+internal void win32BeginRecordingInput(Win32State *state, int inputRecordingIndex) {
+    Win32ReplayBuffer *replayBuffer = win32GetReplayBuffer(state, inputRecordingIndex);
+    if (replayBuffer->memoryBlock) {
+        state->inputRecordingIndex = inputRecordingIndex;
+        state->recordingHandle = replayBuffer->fileHandle;
+        LARGE_INTEGER filePosition;
+        filePosition.QuadPart = state->gameMemoryTotalSize;
+        SetFilePointerEx(state->recordingHandle, filePosition, NULL, FILE_BEGIN);
+        CopyMemory(replayBuffer->memoryBlock, state->gameMemoryBlock, state->gameMemoryTotalSize);
+    }
 }
 
 internal void win32EndRecordingInput(Win32State *win32State) {
-    CloseHandle(win32State->recordingHandle);
     win32State->inputRecordingIndex = 0;
 }
 
@@ -374,18 +375,19 @@ internal void win32RecordInput(Win32State *win32State, GameInput *newInput) {
     WriteFile(win32State->recordingHandle, newInput, sizeof(*newInput), &bytesWritten, NULL);
 }
 
-internal void win32BeginInputPlayback(Win32State *win32State, int inputPlayingIndex) {
-    win32State->inputPlayingIndex = inputPlayingIndex;
-    char *filename = "replay.ipt";
-    win32State->playbackHandle = CreateFileA(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, NULL, NULL);
-    DWORD bytesToRead = (DWORD)win32State->gameMemoryTotalSize;
-    Assert(bytesToRead < 0xFFFFFFFF);
-    DWORD bytesRead;
-    ReadFile(win32State->playbackHandle, win32State->gameMemoryBlock, bytesToRead, &bytesRead, NULL);
+internal void win32BeginInputPlayback(Win32State *state, int inputPlayingIndex) {
+    Win32ReplayBuffer *replayBuffer = win32GetReplayBuffer(state, inputPlayingIndex); 
+    if (replayBuffer->memoryBlock) {
+        state->inputPlayingIndex = inputPlayingIndex;
+        state->playbackHandle = replayBuffer->fileHandle;
+        LARGE_INTEGER filePosition;
+        filePosition.QuadPart = state->gameMemoryTotalSize;
+        SetFilePointerEx(state->playbackHandle, filePosition, NULL, FILE_BEGIN);
+        CopyMemory(state->gameMemoryBlock, replayBuffer->memoryBlock, state->gameMemoryTotalSize);
+    }
 }
 
 internal void win32EndInputPlayback(Win32State *win32State) {
-    CloseHandle(win32State->playbackHandle);
     win32State->inputPlayingIndex = 0;
 }
 
@@ -443,11 +445,13 @@ internal void win32ProcessPendingMessages(Win32State *win32State, GameController
                     } else if (VKCode == VK_SPACE) {
                     } else if (VKCode == 'L') {
                         if (isDown) {
-                            if (win32State->inputRecordingIndex == 0) {
+                            if (win32State->inputRecordingIndex == 0 && win32State->inputPlayingIndex == 0) {
                                 win32BeginRecordingInput(win32State, 1);
-                            } else {
+                            } else if (win32State->inputRecordingIndex != 0 && win32State->inputPlayingIndex == 0) {
                                 win32EndRecordingInput(win32State);
                                 win32BeginInputPlayback(win32State, 1);
+                            } else if (win32State->inputRecordingIndex == 0 && win32State->inputPlayingIndex != 0) {
+                                win32EndInputPlayback(win32State);
                             }
                         }
                     }
@@ -501,30 +505,34 @@ void catStrings(size_t sourceACount, char *sourceA, size_t sourceBCount, char *s
     *dest++ = 0;
 }
 
+void win32GetExeFilename(Win32State *win32State) {
+    DWORD sizeOfFilename = GetModuleFileNameA(NULL, win32State->exeFilename, sizeof(win32State->exeFilename));
+    win32State->onePastLastExeFilenameSlash = win32State->exeFilename;
+    for (char *scan = win32State->exeFilename; *scan; scan++) {
+        if (*scan == '\\') {
+            win32State->onePastLastExeFilenameSlash = scan + 1;
+        }
+    }
+}
+
+void win32GetFullPathToLocalFile(Win32State *state, char *filename, int filenameSize, char *maxPathBuffer) {
+    catStrings(state->onePastLastExeFilenameSlash - state->exeFilename, state->exeFilename, filenameSize, filename, (size_t)MAX_PATH, maxPathBuffer);
+}
+
 #define WINDOW_WIDTH 1280
 #define WINDOW_HEIGHT 720
 
 int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLine, int commandShow) {
-    char exeFileName[MAX_PATH];
-    DWORD sizeOfFilename = GetModuleFileNameA(NULL, exeFileName, sizeof(exeFileName));
-    char *onePastLastSlash = exeFileName;
-    for (char *scan = exeFileName; *scan; scan++) {
-        if (*scan == '\\') {
-            onePastLastSlash = scan + 1;
-        }
-    }
+    Win32State win32State = {};
+    win32GetExeFilename(&win32State);
 
-    char sourceGameCodeDLLFilename[] = "handmade.dll";
+    char *sourceGameCodeDLLFilename = "handmade.dll";
     char sourceGameCodeDLLFullPath[MAX_PATH];
-    catStrings(onePastLastSlash - exeFileName, exeFileName, 
-            sizeof(sourceGameCodeDLLFilename) - 1, sourceGameCodeDLLFilename,
-            sizeof(sourceGameCodeDLLFullPath) - 1, sourceGameCodeDLLFullPath);
+    win32GetFullPathToLocalFile(&win32State, sourceGameCodeDLLFilename, sizeof(sourceGameCodeDLLFullPath) - 1, sourceGameCodeDLLFullPath);
 
     char tempGameCodeDLLFilename[] = "handmade_temp.dll";
     char tempGameCodeDLLFullPath[MAX_PATH];
-    catStrings(onePastLastSlash - exeFileName, exeFileName, 
-            sizeof(tempGameCodeDLLFilename) - 1, tempGameCodeDLLFilename,
-            sizeof(tempGameCodeDLLFullPath) - 1, tempGameCodeDLLFullPath);
+    win32GetFullPathToLocalFile(&win32State, tempGameCodeDLLFilename, sizeof(tempGameCodeDLLFullPath) - 1, tempGameCodeDLLFullPath);
 
     LARGE_INTEGER performanceFrequencyResult;
     QueryPerformanceFrequency(&performanceFrequencyResult);
@@ -572,7 +580,6 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLin
             RegisterHotKey(window, HH_CTRLW, MOD_CONTROL, 'W');
 
             globalRunning = true;
-            Win32State win32State = {};
 
             GameInput input[2] = {};
             GameInput *oldInput = &input[0];
@@ -597,7 +604,7 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLin
 #endif
             GameMemory gameMemory = {};
             gameMemory.permanentStorageSize = Megabytes(64);
-            gameMemory.transientStorageSize = Gigabytes((uint64)4);
+            gameMemory.transientStorageSize = Gigabytes((uint64)1);
             gameMemory.debugFreeFileMemory = debugFreeFileMemory;
             gameMemory.debugWriteEntireFile = debugWriteEntireFile;
             gameMemory.debugReadEntireFile = debugReadEntireFile;
@@ -608,6 +615,25 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLin
             gameMemory.permanentStorage = win32State.gameMemoryBlock;
             gameMemory.transientStorage = ((uint8 *)gameMemory.permanentStorage + gameMemory.permanentStorageSize);
 
+            for (int i = 0; i < ArrayCount(win32State.replayBuffers); i++) {
+                // Filename
+                char prefix[] = "replay-";
+                char suffix[] = ".hmr";
+                const int totalLen = ArrayCount(prefix) + 1 + ArrayCount(suffix);
+                char replayFilename[totalLen] = {};
+                char digit[] = {(char)(48 + i)};
+                catStrings(ArrayCount(prefix) - 1, prefix, 1, digit, ArrayCount(replayFilename) - 1, replayFilename);
+                catStrings(ArrayCount(prefix), replayFilename, ArrayCount(suffix) - 1, suffix, ArrayCount(replayFilename) - 1, replayFilename);
+                win32GetFullPathToLocalFile(&win32State, replayFilename, sizeof(replayFilename) - 1, win32State.replayBuffers[i].replayFilename);
+                Win32ReplayBuffer *replayBuffer = &win32State.replayBuffers[i];
+
+                replayBuffer->fileHandle = CreateFileA(replayBuffer->replayFilename, GENERIC_WRITE | GENERIC_READ, NULL, NULL, CREATE_ALWAYS, NULL, NULL);
+                DWORD maxSizeLow = (win32State.gameMemoryTotalSize & 0xFFFFFFFF);
+                DWORD maxSizeHigh = (win32State.gameMemoryTotalSize >> 32);
+                replayBuffer->memoryMap = CreateFileMappingA(replayBuffer->fileHandle, NULL, PAGE_READWRITE, maxSizeHigh, maxSizeLow, NULL);
+                replayBuffer->memoryBlock = MapViewOfFile(replayBuffer->memoryMap, FILE_MAP_ALL_ACCESS, NULL, NULL, win32State.gameMemoryTotalSize);
+            }
+
             win32InitSound(window, soundOutput.samplesPerSecond, soundOutput.secondaryBufferSize);
             win32ClearBuffer(&soundOutput);
             globalSecondaryBuffer->Play(0, 0, DSBPLAY_LOOPING);
@@ -651,8 +677,6 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLin
                 win32ProcessKeyboardKeypress(&newInput->mouseButtons[3], GetKeyState(VK_XBUTTON1) & (1 << 15));
                 win32ProcessKeyboardKeypress(&newInput->mouseButtons[4], GetKeyState(VK_XBUTTON2) & (1 << 15));
 
-                // TODO(dledda): day 25 34:00
-
                 XINPUT_STATE controllerState;
                 int maxControllerCount = XUSER_MAX_COUNT;
                 if (maxControllerCount > ArrayCount(newInput->controllers) - 1) {

src/win32_handmade.h

@@ -1,4 +1,5 @@
 #include "handmade.h"
+#include <windows.h>
 
 struct Win32OffscreenBuffer {
     BITMAPINFO info;
@@ -29,13 +30,27 @@ struct Win32RecordedInput {
     GameInput *inputStream;
 };
 
+#define WIN32_STATE_FILE_NAME_LENGTH MAX_PATH
+struct Win32ReplayBuffer {
+    HANDLE memoryMap;
+    HANDLE fileHandle;
+    void *memoryBlock;
+    char replayFilename[WIN32_STATE_FILE_NAME_LENGTH];
+};
+
 struct Win32State {
     HANDLE recordingHandle;
     uint32 inputRecordingIndex;
+
     HANDLE playbackHandle;
     uint32 inputPlayingIndex;
+
     uint64 gameMemoryTotalSize;
     void *gameMemoryBlock;
+    Win32ReplayBuffer replayBuffers[4];
+
+    char exeFilename[WIN32_STATE_FILE_NAME_LENGTH];
+    char *onePastLastExeFilenameSlash;
 };
 
 struct Win32GameCode {